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Commitments and Contingent Liabilities - Summary of Detailed Information about Property Plant and Equipment (Detail) - EUR (€)
€ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of Detailed Information about Property, Plant and Equipment [Line Items]      
Property plant and equipment € 10,347 € 10,411  
Cost [Member]      
Disclosure of Detailed Information about Property, Plant and Equipment [Line Items]      
Property plant and equipment 19,924 19,398 € 21,207
Accumulated depreciation [Member]      
Disclosure of Detailed Information about Property, Plant and Equipment [Line Items]      
Property plant and equipment (9,577) (8,987) (9,534)
Plant and equipment [Member]      
Disclosure of Detailed Information about Property, Plant and Equipment [Line Items]      
Property plant and equipment 7,228 7,378  
Plant and equipment [Member] | Cost [Member]      
Disclosure of Detailed Information about Property, Plant and Equipment [Line Items]      
Property plant and equipment 15,321 14,936 16,462
Plant and equipment [Member] | Accumulated depreciation [Member]      
Disclosure of Detailed Information about Property, Plant and Equipment [Line Items]      
Property plant and equipment (8,093) (7,558) € (8,051)
Finance Leases [Member]      
Disclosure of Detailed Information about Property, Plant and Equipment [Line Items]      
Property plant and equipment 133 139  
Finance Leases [Member] | Cost [Member]      
Disclosure of Detailed Information about Property, Plant and Equipment [Line Items]      
Property plant and equipment 322 331  
Finance Leases [Member] | Accumulated depreciation [Member]      
Disclosure of Detailed Information about Property, Plant and Equipment [Line Items]      
Property plant and equipment (189) (192)  
Finance Leases [Member] | Buildings [member]      
Disclosure of Detailed Information about Property, Plant and Equipment [Line Items]      
Property plant and equipment 122 122  
Finance Leases [Member] | Buildings [member] | Cost [Member]      
Disclosure of Detailed Information about Property, Plant and Equipment [Line Items]      
Property plant and equipment 216 206  
Finance Leases [Member] | Buildings [member] | Accumulated depreciation [Member]      
Disclosure of Detailed Information about Property, Plant and Equipment [Line Items]      
Property plant and equipment (94) (84)  
Finance Leases [Member] | Plant and equipment [Member]      
Disclosure of Detailed Information about Property, Plant and Equipment [Line Items]      
Property plant and equipment 11 17  
Finance Leases [Member] | Plant and equipment [Member] | Cost [Member]      
Disclosure of Detailed Information about Property, Plant and Equipment [Line Items]      
Property plant and equipment 106 125  
Finance Leases [Member] | Plant and equipment [Member] | Accumulated depreciation [Member]      
Disclosure of Detailed Information about Property, Plant and Equipment [Line Items]      
Property plant and equipment € (95) € (108)